The data file tennis.txt contains statistics for a number of 
professional tennis players.  The variables in the data file
are the player's first name, last name, number of major match
wins, number of major match losses, number of overall match
wins, number of overall match losses, number of major titles won,
and number of overall titles won.


(a) Read in the data and create a SAS data named tennis 
that has the following names for its columns:  first_name, last_name,
major_match_wins, major_match_losses, overall_match_wins, 
overall_match_losses, major_titles, overall_titles.

(b) Create and add two more columns called major_winning_pct and 
overall_winning_pct (showing winning percentage in the "major" and 
"overall" categories, respectively) to this data frame. print 5 observations
sorted by percentage of major wins, formated to decimal olaces (ex: 89.24%)
  
Note that "winning percentage" is defined 
as (match wins)/(match wins + match losses).

(c) Create a new indicator variable (top10) which has a value of 1 if major win 
percentage >= 81 and 0 otherwise.

d) create a format for the variable you created in previous question.

e) print the total major tile wins (in separate pages) by the indicator variable you created 
in part c) 

(e) Perform a nested sort, sorting the data first by major
titles (from most to least), and then by major winning percentage 
(from most to least) for each levels of top10. 
Print only first 3 observations and variables firstname, lastname, major titles and major 
winning percentage in each levels of top10.

(f) Print the subset of the data set consisting of players
with at least 3 major titles who whose overall winning percentage < 70.  

Use appropriate titles, footnotes and comments. 

Submit your program ONLY.